mirror of
https://github.com/SerenityOS/serenity
synced 2026-05-11 09:26:28 +02:00
743e968561
Instead, this patch makes it get all the information it needs directly from the inode object or the filesystem. This also inlines the cluster-freeing mechanism in remove_child_impl since we can no longer use compute_cluster_list there.
111 lines
4.6 KiB
C++
111 lines
4.6 KiB
C++
/*
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* Copyright (c) 2022-2024, Undefine <undefine@undefine.pl>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Optional.h>
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#include <AK/OwnPtr.h>
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#include <AK/RefPtr.h>
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#include <Kernel/FileSystem/FATFS/Definitions.h>
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#include <Kernel/FileSystem/FATFS/FileSystem.h>
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#include <Kernel/FileSystem/FATFS/SFNUtilities.h>
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#include <Kernel/FileSystem/Inode.h>
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#include <Kernel/Library/KBuffer.h>
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#include <Kernel/Library/KString.h>
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namespace Kernel {
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struct FATEntryLocation {
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BlockBasedFileSystem::BlockIndex block;
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u32 entry;
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};
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class FATInode final : public Inode {
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friend FATFS;
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public:
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virtual ~FATInode() override = default;
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static ErrorOr<NonnullRefPtr<FATInode>> create(FATFS&, FATEntry, FATEntryLocation inode_metadata_location, Vector<FATLongFileNameEntry> const& = {});
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FATFS& fs() { return static_cast<FATFS&>(Inode::fs()); }
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FATFS const& fs() const { return static_cast<FATFS const&>(Inode::fs()); }
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private:
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FATInode(FATFS&, FATEntry, FATEntryLocation inode_metadata_location, NonnullOwnPtr<KString> filename);
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static constexpr u8 end_entry_byte = 0x00;
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static constexpr u8 unused_entry_byte = 0xE5;
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static constexpr u8 lfn_entry_character_termination = 0x00;
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static constexpr u8 lfn_entry_unused_byte = 0xFF;
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static constexpr u8 normal_filename_length = 8;
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static constexpr u8 normal_extension_length = 3;
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static constexpr size_t lfn_entry_characters_part_1_length = 5;
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static constexpr size_t lfn_entry_characters_part_2_length = 6;
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static constexpr size_t lfn_entry_characters_part_3_length = 2;
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static constexpr size_t characters_per_lfn_entry = lfn_entry_characters_part_1_length + lfn_entry_characters_part_2_length + lfn_entry_characters_part_3_length;
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static constexpr u8 last_lfn_entry_mask = 0x40;
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static constexpr size_t max_filename_length = 255;
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static ErrorOr<NonnullOwnPtr<KString>> compute_filename(FATEntry&, Vector<FATLongFileNameEntry> const& = {});
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static StringView byte_terminated_string(StringView, u8);
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static u8 lfn_entry_checksum(FATEntry const& entry);
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static ErrorOr<void> create_unique_sfn_for(FATEntry& entry, NonnullRefPtr<SFNUtils::SFN> sfn, Vector<ByteBuffer> existing_sfns);
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static ErrorOr<void> encode_known_good_sfn_for(FATEntry& entry, StringView name);
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static ErrorOr<Vector<FATLongFileNameEntry>> create_lfn_entries(StringView name, u8 checksum);
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static ErrorOr<void> fill_in_creation_time(FATEntry&, UnixDateTime const&);
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ErrorOr<RawPtr<Vector<u32>>> get_cluster_list();
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ErrorOr<Vector<u32>> compute_cluster_list();
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ErrorOr<Vector<BlockBasedFileSystem::BlockIndex>> get_block_list();
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ErrorOr<NonnullOwnPtr<KBuffer>> read_block_list();
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ErrorOr<RefPtr<FATInode>> traverse(Function<ErrorOr<bool>(RefPtr<FATInode>)> callback);
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u32 first_cluster() const;
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ErrorOr<void> allocate_and_add_cluster_to_chain();
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ErrorOr<void> remove_last_cluster_from_chain();
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ErrorOr<Vector<FATEntryLocation>> allocate_entries(u32 count);
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ErrorOr<void> zero_data(u64 offset, u64 count);
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ErrorOr<void> resize(u64 size, Optional<u64> clear_from, Optional<u64> to_clear);
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ErrorOr<Vector<ByteBuffer>> collect_sfns();
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enum class FreeClusters {
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Yes,
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No,
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};
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ErrorOr<void> remove_child_impl(StringView name, FreeClusters free_clusters);
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// ^Inode
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virtual ErrorOr<size_t> write_bytes_locked(off_t, size_t, UserOrKernelBuffer const& data, OpenFileDescription*) override;
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virtual ErrorOr<size_t> read_bytes_locked(off_t, size_t, UserOrKernelBuffer& buffer, OpenFileDescription*) const override;
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virtual InodeMetadata metadata() const override;
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virtual ErrorOr<void> traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
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virtual ErrorOr<NonnullRefPtr<Inode>> lookup(StringView name) override;
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virtual ErrorOr<NonnullRefPtr<Inode>> create_child(StringView name, mode_t, dev_t, UserID, GroupID) override;
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virtual ErrorOr<void> add_child(Inode&, StringView name, mode_t) override;
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virtual ErrorOr<void> remove_child(StringView name) override;
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virtual ErrorOr<void> chmod(mode_t) override;
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virtual ErrorOr<void> chown(UserID, GroupID) override;
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virtual ErrorOr<void> truncate_locked(u64) override;
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virtual ErrorOr<void> flush_metadata() override;
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virtual ErrorOr<void> update_timestamps(Optional<UnixDateTime> atime, Optional<UnixDateTime> ctime, Optional<UnixDateTime> mtime) override;
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Optional<Vector<u32>> m_cluster_list;
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FATEntry m_entry;
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FATEntryLocation m_inode_metadata_location;
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NonnullOwnPtr<KString> m_filename;
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};
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}
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